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Hey Tanuj,

- At one point, you used $q_{i}$ and $p_{u}$ to describe the latent features, then changed it to $f_{i}$ and $g_{u}$.

- If the correct way is

$(\sum _{<u,i,r>\in D}(r^{'}+b_{i}+c_{u}+(\sum _{\overline {s}}f_{ik}g_{ku})-r)^{2})+(\lambda (b_{i}^{2}+c_{u}^{2}+\sum _{k}(f_{ik}^{2}+g_{ku}^{2})))$

Then where are the indices $i$ and $u$ for the second term coming from...? What is the outermost bracket supposed to mean?

- What are the differences now that you've made this change?

03:46, 21 April 2016